/*
 * Copyright 2018 The Kubernetes Authors
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 * http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

function polyfillGetUrlParameter(name: string): string {
  name = name.replace(/[[]/, '\\[').replace(/[\]]/, '\\]')
  const regex = new RegExp('[\\?&]' + name + '=([^&#]*)')
  const results = regex.exec(location.search)
  return results === null ? '' : decodeURIComponent(results[1].replace(/\+/g, ' '))
}

/**
 * Extract the value associated with the given window.location.search key
 *
 */
export const extractSearchKey = (key: string): string => {
  if (typeof URLSearchParams === 'function') {
    return new URLSearchParams(window.location.search).get(key)
  } else {
    return polyfillGetUrlParameter(key)
  }
}
